[填空题]
One means of enriching uranium is 45i7izb8 51u2 wf,7if hskbzos0nza aby diffusion of th ,go(+n3sewije gas $\text{UF}_6$. Calculate the ratio of the speeds of molecules of this gas containing $_{92}^{235}\text{U}$ and $_{92}^{238}\text{U}$ on which this process depends. :1